Why does the C standard leave use of indeterminate variables undefined?

Question

Where are the garbage value stored, and for what purpose?

Answer 1

Why does the C standard leave use of indeterminate variables undefined?

It does not :-) :

• for local variables, it says undefined behavior, which means that anything (e.g. segfault, erasing your hard disk) is legal: (Why) is using an uninitialized variable undefined behavior?

• for global variables, it zeros them: What happens to a declared, uninitialized variable in C? Does it have a value?